The diff is only half the story.
Agents produce working code at speed. Speed without a look at the result is how you ship slop. See exactly what an agent built, before it merges.
Agent code satisfies the requirement and misses the point
The agent wrote the form — does it tab correctly? It added the dialog — does it feel right? You can’t tell from the diff, and you can’t keep up reading every change by hand. Technically correct and subtly wrong is the whole problem.
Every agent pull request arrives checkable
When an agent opens a pull request, your existing suite runs and Midstream captures every scene it reaches. The agent handled the code; you check the experience.
- Every agent pull request ships with clickable proof of what it built.
- Check the result in seconds, instead of reading the implementation line by line.
Regression at the interaction level, not the pixel
A capture tells you the screen changed. Clicking through the flow tells you whether it still works. Midstream marks what moved so you spend that attention where it counts.
Scale agent output without scaling risk
Let agents open ten pull requests a day. Each one lands with its own scenes, in the same catalog, opened the same way. Volume stops being frightening when every item in it arrives already checkable.
Ship faster without shipping worse
Agents get more leverage because you can trust and check their output where it is actually judged — in the running app.
An agent can write the code. Whether it feels right is still a human call — now you can make it in one click.
Trust what agents ship. Verify it in one click.
One line of code. No card.